untreated
adjective
un·treat·ed
ˌən-ˈtrē-təd 
: not treated
untreated wastewater
especially
: not improved or controlled medically
an untreated case of pneumonia
untreated diabetic patients
Examples of untreated in a Sentence
untreated wool
Recent Examples on the Web
Researchers tested whether untreated coffee waste could clean water without extra processing.
—
Aamir Khollam, Interesting Engineering, 17 Dec. 2025
After the audit, the ETP is switched off again and untreated wastewater is discharged into nature.
—Céline Van De Loo, Sourcing Journal, 16 Dec. 2025
Other standouts on the list today were shorts grounded in various degrees of reality between the natural rhythms of the human body, the innate desires of passion and the effects of untreated horrors within a mental health crisis.
—Destiny Jackson, Deadline, 16 Dec. 2025
If left untreated, a deficiency in vitamin D can lead to a number of health complications.
—Laura Dorwart, Verywell Health, 15 Dec. 2025
See All Example Sentences for untreated
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Aamir Khollam, Interesting Engineering, 17 Dec. 2025
After the audit, the ETP is switched off again and untreated wastewater is discharged into nature.
—Céline Van De Loo, Sourcing Journal, 16 Dec. 2025
Other standouts on the list today were shorts grounded in various degrees of reality between the natural rhythms of the human body, the innate desires of passion and the effects of untreated horrors within a mental health crisis.
—Destiny Jackson, Deadline, 16 Dec. 2025
If left untreated, a deficiency in vitamin D can lead to a number of health complications.
—Laura Dorwart, Verywell Health, 15 Dec. 2025
See All Example Sentences for untreated
Cite this Entry
“Untreated.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/untreated. Accessed 27 Dec. 2025.
Copy CitationMedical Definition
untreated
adjective
un·treat·ed
-ˈtrēt-əd
: not subjected to treatment
an untreated disease
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